Grinder



Aug. 18, 1942. .1. w. IRESIDE 2,293,216

GRINDER Filed July 14, 1941 I INVENTOR JAMES WRESIDE ATTORNEYS PatentedAug 18, 1942 UNITED STATES PATENT OFFICE GRINDER James W. Reside,Racine, Wis.

Application July 14, 1941, Serial No. 402,328

1-Claim.

This invention appertains to grinders, and more particularly to a novelmachine for finishing the inner edges of fiat annular plates,

In the manufacture of said rings for corn planters, it is customary to,first, cast the rings, and, then, to polish or finish off the roughedges of the rings. The peripheries of the rings can be quickly groundoff with the use of a conventional grinding wheel. However, in view ofthe radial lugs on the inner edges of the rings, it has been necessaryfor the workmen to employ hand files to finish off the inner edges ofthe rings. This is a laborious and time-consuming operation.

Therefore, one of the primary objects of my invention is to provide aspecially designed grinding machin which will quickly and effectivelyfinish the inner edges of the rings and the radial lugs without undueeffort or the expenditure of a large amount of time on the part of theoperator.

Another salient object of my invention is to provide a grinding machinefor finishing off the inner edges of said rings, which embodies 'a tablefor removably receiving the rings and a rotary grindstone extendingthrough the table and rings for effectively engaging the inner surfacesof the rings.

A further object of my invention is to provide novel means for adjustingthe table and grindstone or other abrasive wheel relative to oneanother, whereby to permit the expeditious finishing of inner edges ofrings of different characters.

A further important object of my invention is to provide a grindstone orother abrasive wheel of a special character and type, so that thecorners of the radial lugs can be .quickly and expeditiously ground.

A still further object of my invention is to provide a grinding machinefor finishing off the inner edges of the seed plates of corn planters,which will be durable and efficient in use, one that will be simple andeasy to manufacture, and one which can be placed upon the market at areasonable cost.

With these and other objects in view, the invention consists in thenovel construction, arrangement, and formation ofparts, as will behereinafter more specifically described, claimed,

and illustrated in the accompanying drawing, in

which drawing:

Figure 1 is a top plan view of my novel ma chine, with parts thereofbroken away and in section to illustrate structural detail.

Figure 2 is a longitudinal sectional view through the machine, taken onthe line 2-2 of Figure I, looking in the direction of the arrows.

Figure 3 is an enlarged, fragmentary, plan view of a seed ring of a cornplanter, showing th unfinished inner edge thereof.

Figure 4 is a view similar to Figure 3, showing the inner edge of thering and a radial lug being finished by the novel grindstone or otherabrasive wheel.

Referring to the drawing in detail, wherein similar reference charactersdesignate corresponding parts throughout the several views, the letter Mgenerally indicates my novel grinding machine, and the same includes abase plate 5, which is adapted to be placed on and secured to a workbench or the like. This base plate 5 has connected therewith upstandingstandards 6, to the upper ends of which are firmly secured the worktable I for the seed rings R which are to be finished. The center partof the table has formed therein an opening 8 through which projects thebearings 9 for the shaft ll) of a grindstone or other abrasive wheel H.The bearings 9 are carried by the upper ends of pillar posts I2, andthese posts can be firmly secured to the base plate 5. From thedescription so far, it can be seen that the grindstone ll projectsthrough the center part of the table.

Fastened to the shaft [0 is a pulley wheel l3, and this pulley wheel isadapted to be driven by a belt M. The belt M can be driven from a lineshaft or from an electric motor l5, which can be secured to the baseplate 5.

In accordance with my invention, the abrasive wheel or grindstone H isof a special construction, and by referring to Figures 1 and 4, it willbe noted that the periphery thereof is beveled or inclined, as at IS.

The seed rings R. are of the usual construction and will not bedescribed in detail, but it is to be noted that each ring includes afiat annular body I! having inwardly projecting lugs [8. During thecasting of the rings R, rough edges are formed on the rings, and it isnecessary to finish ofi or polish these rough edges. In Figure 3, I haveshown the seed ring R with a rough inner edge l9, and it will also benoted that the edges of the lugs are also cast with a rough edge.

In use of my machine, the outer edges of the rings are first finished inany preferred way, and the rings are then placed on the work table I insuch a manner that the abrasive wheel II will project through the ring.

Upon the driving of the abrasive wheel, the ring is brought intoengagement with the periphery of the wheel, and the ring is slowlyturned by the operator until the rough edges are finished 01f. Due tothe shape of the periphery of the wheel, the inner edge of the seedrings can be accurately ground.

By referring to Figures 1 and 4, it can be seen that the abrasive wheelis of such a shape as to permit the quick and efficient grinding of thecorners of the lugs where the lugs merge with the body of the ring.Thus, one side face of the abrasive wheel is utilized for finishing aside edge of the lug, while the periphery of the wheel issimultaneouslyused for finishing the inner surface of the ring adjacent the lug.

With my machine, the inner edgesrof the rin s can be quickly andaccurately finished without undue eifort on the part of the operator.

It is desirable to provide means for adjusting the table and abrasiveWheel relative toone another, so that the centerof the shaft Ill-and thewheel can be adjusted relative to the top of the et While the grindstoneitself can be raised or lowered, in the drawing I have shown the table 1adjusted. To accomplish this, the standards 6 can be made in twotelescoping parts 2| and 22. A winged nut and bolt 23 can be utilizedfor each standard to hold the parts thereof in a selected adjustedposition.

Changes in details may be made without departing from the spirit or thescope of my invention, but what I claim as new is:

A grinding machine for finishing off the inner edges of annular platescomprising, a base plate, a work table having a central opening disposedabove the base plate, adjustable standards connecting the table to thebase plate, bearing pedestals secured to the base plate and projectingthrough the opening in the table, a horizontal shaft rotatably carriedby the upper ends of the pedestals, an 'abrasive wheel mounted on theshaft for rotation therewith, said abrasive Wheel projecting through theopening in the table, whereby annular plates can be placedon the tableover the wheel, and means for rotating the shaft.

JAMES W. RESIDE.

